9 Mouth Chemical and mechanical digestion. Food is chewed (masticated) mechanically.A bolus (lump) is formed with saliva and the tongue.
10 B. MouthSaliva: Fluid released when your mouth waters and plays an important part in both mechanical and chemical digestion.Types of DigestionMechanical Digestion- Teeth begin digestion by cutting, tearing, and grinding food
11 mouthbreak up fooddigest starchkill germsmoisten food
12 C. Esophagus- Total Time 10 seconds. 1. 1. Epiglottis:Flap of tissue that seals off your windpipe preventing food from entering.2. Esophagus:Food enters a muscular tube that connects the mouth to the stomach.3. Mucus:Thick, slippery substance that lines the esophagus in order to make food easier to swallow and move along
13 You have a trap door called the epiglottis to cover your windpipe when you swallow.
14 Peristalsisseries of involuntary wave-like muscle contractions which move food along the digestive tract
15 Stomach Food is temporarily stored here. Gastric juices are secreted. Has layers of muscle that line the inside.Mechanically and chemically breaks down food.
16 Mechanical Digestion: Three strong layers of smooth muscle contract to produce a churning motion. (similar to a washing machine)2. Chemical Digestion: Churning food makes contact with digestive juices.a. Enzyme Pepsin- Works best in an acid environment. b. Hydrochloric Acid (HCl).-Kills many bacteria that you swallow with food, mucus protects stomach lining from this acid.c. Food remains in the stomach until the entire solid has been broken down.
17 Your stomach mashes your food the way a baker kneads dough for bread.
19 Your stomach stretches when you eat like a balloon being filled with air
20 mouthbreak up fooddigest starchkill germsmoisten foodstomachkills germsbreak up fooddigest proteinsstore foodsphinctersphincter
21 Small Intestine Most chemical digestion takes place here. Simple sugars and proteins are absorbed into the inner lining.Fatty acids and glycerol go to lymphatic system.Lined with villi, which increase surface area for absorption, one cell thick.
22 3. Absorption in the Small Intestine Villi:Fingerlike structures increase the surface area of the small intestines and allow nutrient molecules to pass into the blood
23 Small Intestine Tube that is 20 feet long. Continues to digest food Food stays in your small intestine for 4 to 8 hours
24 Large Intestine Solid materials pass through the large intestine. These are undigestible solids (fibers).Water is absorbed.Vitamins K and B are reabsorbed with the water.Rectum- solid wastes exit the body.
25 Large intestines (colon) Functionre-absorb wateruse ~9 liters of water every day in digestive juices> 90% of water reabsorbednot enough water absorbeddiarrheatoo much water absorbedconstipation
26 B. The Large Intestine-The last section of the digestive system that contain bacteria that feed on material and make vitamins (1.5 meters long)-The role is absorb water into the bloodstream and get remaining material ready for elimination.
27 Large Intestine Tube that is 5 feet long Gets waste from small intestineWaste stays for 10 to 12 hours
28 Rectum Last section of colon (large intestines) eliminate feces undigested materialsextracellular wastemainly cellulose from plantsroughage or fibermasses of bacteria
30 PancreasAn organ which secretes both digestive enzymes (exocrine) and hormones (endocrine)** Pancreatic juice digests all major nutrient types.Nearly all digestion occurs in the small intestine & all digestion is completed in the SI.
31 Gall bladderPouch structure located near the liver which concentrates and stores bileBile duct – a long tube that carries BILE. The top half of the common bile duct is associated with the liver, while the bottom half of the common bile duct is associated with the pancreas, through which it passes on its way to the intestine.
32 BILE Bile emulsifies lipids (physically breaks apart FATS) Bile is a bitter, greenish-yellow alkaline fluid, stored in the gallbladder between meals and upon eating is discharged into the duodenum where it aids the process of digestion.
33 mouthbreak up fooddigest starchkill germsmoisten foodstomachkills germsbreak up fooddigest proteinsstore foodliverproduces bile- stored in gall bladderbreak up fatspancreasproduces enzymes todigest proteins & starch
34 Healthy HabitsEat foods that are high in fiber like fruits and vegetables